Type-writer.



J. A. WHITGOMBL TYPE WRITER.

APPLICATION IILED MAY 23,1910.

2 1 M, m m M a m M d I m I m m w. H mm A Q .Q w W J WW M a M 2 7,, Ga wM 0, Wu 1 To all whom it may concern JAMES A. wmroomn, or MeALnsrEn,OKLAHOMA.

' Tyre-WRITER.

Specification of Letters Patent.-

Patented Aug. 20, 1912.

Application filed. May 23, 1810. Serial No. 582,870.

.Be it known that I, JAMES A. WHITCOMB,

a citizen of the United States, and a resident of the city of McAlester,in'the county of Pittsburg, Stateof Oklahoma, have invented certain newand useful Improvements in Type-Writers, of which the following is aspecification.

This invent-ion relates broadly to type- .writing machines andspecifical y to back spacing mechanism whereby the carriage may be movedone space at a time in a direction opposite to the ordinaryletterfeeding. The rincipal object of my invention is to provide a backspacing mechanism particularly adapted to a typewriting machine of\ thefoldingtype, wherein the carriage bed mechanism is pivoted to turn'about a pivotal mount upon the machine frame.

Another object of my invention is to provide aback spacing mechanismwherein the back space key is located at the upper right hand corner ofthe key board in front of the front board of a typewriting machine ofthe folding type, and connecting links which translate a verticalmovement of the key into a horizontal movement of a back spacing dogwhich is adapted to engage the carriage rack.

A still further object of the invention is to provide a key operatedback spacing mechanism articularly adapted to a typewriting'macliine ofthe folding type, wherein one pivotal connection of the back spacingmechanism is arranged to lie in the axis about which a ortion of themachine is adapted to be fo ded.

A still further object of the invention is toprovide a back spacingmechanism Wherein the back spacing dog carrier may have a movementindependent of the back spacing key, and connecting links from the keyto the dog carrier.

A still further object of the invention is to provide a back spacingmechanism adapted particularly to a typewriting machine of the folditype, wherein the car riage is adapted to ifie folded over otherportions of the machine, the construction of the back spacing mechanismcomprising a key definitely positioned in the proximity of the keyboard, and connecting links between the key and the back spacing dogcarried upon the foldable carriage and arranged in such manner that theconnections from the key to the back spacing dog are not broken at anytime when the carriage is in normal or abnormal position.

Other objects of the invention will in art be obvious and in partpointed out in the description of structure which follows herelnafter,wherein the invention will be more specifically described by referenceto the accompanyin drawing which form apart of this app ication, and thesco e of the invention Wlll be indicated by the appended claims. a

In the drawin s like numerals represent like parts throug out theseveral figures.

Figure 1 is a perspective showing the general construction of atypewriting machine in dotted lines and showing my invention in fulllines. Fig. 2 is a perspective of the back spacing dog, showing itsrela-.

tionship to the feeding rack. F1 3 is a detail perspective showing therelation of the pivot or hinge of a folding typewriter in its relationto the pivotal point between the key mechanism and the back spacingmechanism. Fi 4 is a detail view of a part of the feeding dog showing aconnection which allows independent movement of the feed dog carrier inits relation to the I the influence of the carriage feeding drum.

It is particularly desirable to be able'to move the carriage backward ina step-bystep motion, where the typewriting machine is not provided withtabulating mechanism and where the operator depends either upon thespace key or upon the well known feeding release key, to position thecarriage with reference to any particular desired tabulated work. Backspacers that'are operated through keys located in the vicinity of thekey board, are well known in the general typewriter art. However, thereappears to be no typewriting machine of the folding type wherein thecarriage is folded with relation to the frame work of the machine, thatis provided with a back spacing key located in or near the proximity ofthe key board and arranged to operate a backspacing dog which cooperateswith the feeding rack to move the carriage in a direction opposite tothe normal letter spacing. Applicant has constructed a mechanism whichis at all times in complete relation, by that meaning that no parts aredisconnected, when the carriage is folded or when the carriage is innormal osition, and has provided a structurewit a key definitely locatedin the machine frame on a part which is not moved when the carriage isfolded.

Referring more particularly to the drawings, a key cap 1 is mounted upona key stem 2, which is blfurcated to form a slot 4,'that is constructedto have sliding engagement with a stud pin 5 fixedly mounted in themachine side frame 6. A bell crank 7 is mounted upon a transverse rod 8,that is adapted to carry one set of keys of the key board, (not shown inthe drawings) and the bellcrank 7 is provided with a forwardly extendinarm 9 which projects through an opening in the front board 10, and ispivota 12, to the key stem 2. A coiled spring 14 is attached tothe frontboard 11 and to the forwardly extending arm 9 of the bell crank 7. Anulpwardly extending arm 15 of the bell cran 7 is bent forward into acurved portion 16 in such manner that a pivotal point '17, where thecurved portion 16 is attached to a rearwardly extending link 18, liesco-incident with the axis of the pivotal oint 19 wherein a carria e suortin bar p g pp g *26- and to the carriage bed 24.

20 is adapted to pivot about a screw bolt 21 in the machine side frame6. The link 18 is adapted to extend rearwardly in a relationshipsubstantially parallel to the pivoted carriage supporting bar 20, and atits rear end is connected with one arm of a. small bell crank 22, thatis pivotally mounted upon the under side of the carriage bed 24. A shortlink 25 is connected wlth the other arm of the bellcrank 22 and a dogcarrying frame 26. The short link 25 is constructed with a hook 27 uponthe end which cotiperates with the bell crank 22, and is provided with aswaged head. 28 upon the end which is connected with the dog carryingframe 26. The connection between the dog carrying frame 26 and the shortlink 25 is a loose connection, so that the dog carrier may slide uponthelink 25 in the direction of its len th and away from the swaged head28. he dog carryingframe 26 "is provided with an upwardly extending,

portion 29, which carries a small in 30 that is adapted to slide in aslot .31, ormed in a block member 32, that is set in the carriage bed24. The forward portion of the dog carrying frame 26, is also providedwith a raised art 34, in which is formed a slot 35, that Is ada ted toco6 erate with a pin 36, which is riven in t' ough the carriage frameand passes across a slot 37, that is cut in the carriage bed 24. Abackspacing dog 38, is mounted on the outer end of the dog carryin frame 26,by means of a rivet 39, and is ormed in the shape of a mounted at 11, bymeans of a, rivet to engage the teeth of a carriage feedin rack 40, andthe other end of the bell cran dog 1s constructed to engage a stop '41,that is formed integral with the dog carrying frame 26. The stopengaging end of the dog member 1s also provlded with an offset portionwhich forms a means of engage ment for a wire spring 42, which isfixedly mounted in the dog carrying frame 26 at a point 44, in suchmanner that it exerts a force upon the dog to keep the stop 41 and theextended arm of the back spacing dog normally in constant en agementwith-the slot 31. The slot 31, w ich is formed in the block member 32,is astraiglit line slot so that when the pin 30 is moved through- 25 bymeans of a small coiled spring 45 that is attached to the dog carryinT%frame ward movement of the dog carrying frame 26 causes the pin 36normally to be 1n en-.

gagement with an an l ar portion ofthe slot walls in the raise part 34of the dog carrying frame 26, as is shown in Fig. 2.

The operation of the back spacing device is as follows :--The key cap 1is forced downwardly and the key stem 2 is guided by means of the slot 4and the stud pin 5. The key stem in moving downwardly carries with itthe forwardly extending'arm of the bell crank 7, thus extendin thecoiled spring 14 and moving rearwar y the arm 15 of the bell crank 7,which gives substantially a longitudinal movement to the link 18, whichby its connection with the bell crank 22, gives substantially alongitudinal movement to the short link 25. The swaged head of the-shortlink 25, by engagement with the dog carrying frame 26, moves the dogcarrying frame 26 rearwardly. The pin 30 is drawn rearward in the slotand causes the rear portion of the do can ing frame 26 to move in aplane su stantially parallel with the, carriage bed 24. As the dogcarrying frame 26 moves rearwardly, the walls of the slot 37 ride overthe pin 36 and cause the forward end of thedo carrying frame to take anupward. and 'agonal movement until the engaging face of the back spacingdog tooth of the carriage rack. After the dog 38 is in engagement withthe tooth of the carriage rack, the dog carrying frame movessubstantially 'n a horizontal plane, for the s forf 38 is m contact witha reason that the pin 36 hasengaged tbe-.-par

allel portion of the-slot 37, an the 'g of the slots 31 and 37ers suchthat the bee spacing dog can move a distance suxflicient to permit thefeedin dogs in the feed mechamsm (not shown? to escape one letter space.

As hereinbefore stated, since this application pertains specifically toa back spacing mechanism, the other well known arts of a typewritingmachine have eit er been omitted'entirely from the drawings or have beenindicated by dotted lines. However,

- and described in the application of Charles rial No. 545,502, filedFeb. 23, 1910.

H. Richardson, typewrlting machines, Se-

Having described my invention what I claim as new and desire to secureby Letters Patent is 1. In a typewriting machine, the combination of acarriage feeding rack, a dog carrier provided with an angular slot, adog pivotally mounted upon said dog carrier, a pin adapted to cotiperatewith the walls of said slot, a carriage bed, a bell crank lever mountedupon said carriagebed, a link connecting said dog carrier and said bellcrank lever, a machine frame, a com ound key lever mounted in saidmachine rame, said com ound key lever comprising a bell crank, a lieystem pivotally attached to one arm of said bell crank, means for guidinga key stem in substantially a vertical direction, and a link extendinfrom said compound key lever to said be 1 crank,

2. In a typewriting machine, the oomb1-- nation of a carriage feedingrack, a carriage bed, a dog carrier mounted for, endwise movement m aslot in said carriage bed, a dog carried by said dog carrier, a bellcrank mounted upon said carriage bed, a link connectin said bell crankand saiddog carrier in suc manner that said dog carrier may have amovement independent of said link, mounted for vertical movementpivotally attached to said bell .crank, and operative means connectingthe 'bell crank mounted in the machine frame and the bell crank' mountedupon the carriage bed.

3. In a typewriting machine the combination of a carriage feeding rack,a carriage bed, a dog carrier mounted for reciprocal *a link connectingsa' 05 motion in said carriage bed, said dog carrier being provided withan angular slot, a dog mounted upon said do carrier, a bell cranki bellcrank and sai dog carrier in such manner as to permit said dog carrierto have a movement independent of said link, a compound key levercomprismg a bell crank, a key stem ivotally mounted upon ,one arm ofsaid bel crank, means for guiding said key stem in substantlally avertical movement, and o erative means connecting said com oun key leverwith said first mentioned 11 crank.

4. In atypewritin machine, the combination of a machine aine, carriagefeeding rack, a carriage bed pivotally mounted to swlngon the machineframe, a dog carrier mounted for reciprocal motion in said carriage bed,a dog for causing said og to engage said carriage rack when said dogcarrier is moved longi tud1nally,'a bell crank, a link operativelyconnecting said bell crank andsaid do carr1er 1n such manner as topermit sai dog carrler to havea movement independent of said link, acompound key lever mounted in the machine frame, and operative meansconnectmg said compound ey lever and said bell crank.

5. In a typewriting machine, the combination of a machine frame,carriage feedmg rack, a carriage bed pivotally mounted to swing on themachine frame, a dog carrier mounted for reciprocal movement on saidcarriage bed, a dog mounted upon said dog carrier, means for causingsaid dog to en(gage said carriage feeding rack when said og carrier ismoved in a direction op.- posite to that which the carriage rack travelsunder the influence of the carria e moving power, a key mechanismmounted in the mac ine frame, and means connecting said key mechanismwith said dog carrier in such manner that said dog carrier is capable ofmovement independently of said connecting means, substantially asdescribed. 7

6. In a typewritin machine, the combination of a machine rame, carriagefeeding rack, a carriage bed pivotally mounted to swing on the machineframe, a dog carrier mounted on. said carriage bed in such manner as tohave reciprocal motion thereon in a direction substantiall arallel withthe length of the carriage lied a dog mounted on said dog carrier, meansfor causing said dog to engage said carriage feeding rack when said dogcarrier is moved in a direction 0 posite to the movement of the carriageeeding rack when said carriage feeding rack is moving under theinfluence of the carriage prope ling power, a compound key lever mountedin the front portlon of said machine frame, and means 0 erativelyconnecting said compoundv key ever and said dog carryi frame.

, 7. In a typewritmg machine, the combina- (r011 said dog carrier, meansa I enemas tion of a machine frame, carriage feeding rack, a carriagebed pivotally mounted to swing on said machine in e, a dog earner, a dogmounted upon said dog car r1er,-a compound key lever mounted on saidmachine frame in the front portion thereof, a key cap operativelyconnected with said compound ey lever in such manner as to have asubstantially vertical movement, and operative means connecting saidcompound key lever with said dog carrying frame in such manner that saidcarriage feeding rack is retracted against the carriage propelling powerwhen said hey cap is depressed.

8. In a typewritlng machine, the combination of a machine frame, acarriage bed pivotally mounted to swing on said mach ne frame, carriagefeeding rack, a dogcarrler, a dog mounted upon said dog carrle sald dogcarrier being provided with an angular slot, means cotiperating withsaid slot in such manner as to cause the dog to become operative toretract the carriage feedlng rack against the carriage propelling powerwhen the dog carrier is operated, a finger key mounted in said machineframe near the front thereof, and o erative means connecting said fingerkey wlth said dog carrier.

9. In a typewriting machine, the combination of a machine frame, acarriage bed pivotally mounted to swing on said machine frame, carriagefeeding rack, a dog carrier, a dog mounted upon said dog carrier, saiddog carrier being provided with a slot,

means coiiperating with the walls of said slot for causing the dog uponsaid dog car-' rier to become operative when the dog carrier is moved ina direction substantially opposite to the movement of the carriagefeeding rack when said rack is moving under the influence of thecarriage propelling power, a finger key mounted for substantiallyvertical movement in said machine frame, and means operativelyconnecting said finger key and said dog carrier in such manner that saiddog is movable independently of said connecting means.

10. In a typewriting machine, the combination of a carriage'feedingrack, a dog carrier, a stop upon said dog carrier, a dog pivotallymounted upon said dog carrier, a portion of said dog being normall inengagement with said stop, a finger ey, and means operatively connectingsaid finger key with said dog carrier, the 'constructlon and arrangementof parts being such that said dog carrier may have movement inde pendentof said finger key.

11. In a typewriting machine of the folding type, the combination of amachine frame, a carriage bed, a supporting bar for said carriage bedivotally attached to said machine frame, a ger key mounted in saidmachine frame, a back spacing dog operatively mounted in said carriagebed, jointed ng dog, a

operative means connecting said finger key and saidback spacing dog, theaxis of one joint in said jointed connections being substantiallyco-mcident with the axis about which t e carriage bed is adapted to bemoved to abnormal position when the machine is folded.

12. In a t ewriting machine of the folding type, t e combination of amachine frame, a carria e bed, carriage bed supporting bars pivota lyattached to said machine frame, a carriage feeding rack, a back spacngdog, means for carrying said back spackey mounted in said machine frameand adapted to have substantially vertical movement, jointed connectinnisms operatively connecting said ey' with said back spacing dog, theaxis of one joint of said jointed mechanisms being substantiallyco-incident with the axis about which saidcarriage is folded,substantially as described.

13. In a typewriting machine of the folding type, the combination of amachine frame, a carriage bed, a carriage bed sup porting bar pivotallymounted on said machine frame,a carriage feeding rack, a dog carriermounted for movement in said carriage bed, a dog mounted upon said dogcarrier, a bell crank mounted upon said carriage bed, link mechanismoperatively connecting said dog carrier with said bell crank in suchmanner that said dog carrier is moved independently of said connectinglink, a finger key operatively mounted in said machine frame, andjointed mechanisms operatively connecting said finger key with said bellcrank, the axis of one joint in said mechanisms lying substantiallyco-incident with the axis about which the carriage bed is folded toabnormal position, substantially as described.

14. In a typewriting machine of the folding type, the combination of amachine frame, a carriage bed, pivotal means for permitting saidcarriage bed to be folded to abnormal position, a carriage feeding rack,a dog carrier, a dog on said dog carrier, a finger key operativelymounted in said machine frame, jointed mechanisms operatively connectingsaid finger key with said dog carrier, the pivotal axis of one joint insaid jointed mechanisms being substantially coincident with the axisabout which the carriage bed is folded to abnormal position.

15. In a typewriting machine of the folding type, the combination of amachine frame, a carriage bed, a carriage feeding rack, a dog carrier, adog pivotally mounted on said dog carrier, means for causing said dog tobecome operative to move said carriage feeding rack in a directionopposite to its movement under the influence of the carriage propellingpower, a fingerakey operatively mounted in said machine frame, ointedmechanisms operatively connecting said finger key with said dog carrier,the axis of one joint in said pointed mechanisms being substantiallyco-incident with the axis about which .said carriage bed is folded toabnormal position.

16. In a typewriting machine of the foldable type wherein the carriagebed is adapt ed to be moved to abnormal position, the combination of amachine frame, a carriage bed, a back spacing dog mounted on saidcarriage bed, a finger key mounted for substantially vertical movementin said machine frame, and operative means connecting said finger keywith said back spacing dog.

17. In a typewriting machine of the foldable type wherein the carriagebed is adapted to be moved to an abnormal position, the combination of aback spacing dog, a dog carrier, means for causing said back spacing dogto become operative when said dog car- 18. In a typewriting machine ofthe foldable type wherein the carriage bed is adapted to be moved fromnormal to abnormal position, the combination of a machine frame, acarriage bed, means for permitting said carriage bed to be moved toabnormal position, a dog carrier, a back spacing dog on said dogcarrier, a key operatively mounted in said machine frame, and meansoperatively connecting said finger key with said dog carrier.

JAMES A. WHITCOMB.

Witnesses:

E. E. ST. GERMAIN, A. V. Mmmocn.

